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In the real world, you can wave, hug, or high-five your friends hello, and soon you may have a similar range of nonverbal options on Facebook. The social network is testing a new \u201cGreetings\u201d feature that will let users send digital salutations in the form of a wave, high five, wink, hug, or\u2014this will sound familiar\u2014poke. The feature, which the Next Web spotted and appears to be rolling out to some users in the U.K.